Place potato in a Dutch oven, and cover with water. Bring to a boil. Reduce heat; simmer 12 minutes or until tender. Drain.

Combine the half-and-half and next 4 ingredients (half-and-half through egg) in a large bowl, stirring with a whisk. Add potato to egg mixture; beat with a mixer at medium speed until smooth. Spoon potato mixture into a 13 x 9-inch baking dish coated with cooking spray.